How to make video protection through an activation key?

Question

Video

Good afternoon, please tell me how to make such a protection for the video.
Like here
"The training course is protected. To run it, you will need an activation key, which for the digital version of the course you will receive in an email along with a download link. To activate, you need access to the Internet. Activation needs to be done only at the first launch, on all subsequent launches the key will not be requested, and access to the Internet is not required. With one key, you can run the course on three different computers. The key is tied to the hardware of the computer and reinstalling Windows does not affect it."

Answer 1

Don't worry, it's useless. If someone really wants to, he will simply record what is happening on the screen (your video) in real time.
In the most hopeless case, they will take a "screen" on the phone.

Answer 2

Like this
infoprotector.ru
But this is inconvenient for users.
Video can always be intercepted from the screen at the time of playback.
A serious protection - only through the installation of a user special. software.
Will they do it?
If the course is aimed at people who are new to computers, you will be tired of explaining how to install this software.
If the course is aimed at people who know how to work with a computer, they will rob the screen at the time of playback.
Here are descriptions of existing mass solutions
mobile-review.com/mp3/articles/drm.shtml